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What is the measure of 4? Explain how you know.​

What is the measure of 4? Explain how you know.​-example-1

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The measure of 4 is 90°. This is because the line it is on is a straight line, meaning it’s 180°. The angle that is adjacent to 4 is 90°, so you subtract 90 from 180, giving you 90°.
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